 const validCodeObj = {
  
//生成并渲染出验证码图形
 draw: function (sCode) {
    var show_num = [];
    if (sCode.length < 3) return
    var canvas_width=$('#canvas').width();
    var canvas_height=$('#canvas').height();
    var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
    var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
    canvas.width = canvas_width;
    canvas.height = canvas_height;
    // var sCode = "1,2,3,4";
    var aCode = sCode;
    var aLength = aCode.length;//获取到数组的长度
    
    for (var i = 0; i < 4; i++) {  //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
        var deg = Math.random() - 0.5; //产生一个随机弧度
        var txt = aCode[i];//得到随机的一个内容
        show_num[i] = txt.toLowerCase();
        var x = 10 + i * 20;//文字在canvas上的x坐标
        var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
        context.font = "bold 23px 微软雅黑";

        context.translate(x, y);
        context.rotate(deg);

        context.fillStyle = validCodeObj.randomColor();
        context.fillText(txt, 0, 0);

        context.rotate(-deg);
        context.translate(-x, -y);
    }

    for (var i = 0; i <= 5; i++) { //验证码上显示线条
        context.strokeStyle = validCodeObj.randomColor();
        context.beginPath();
        context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
        context.stroke();
    }

    for (var i = 0; i <= 30; i++) { //验证码上显示小点
        context.strokeStyle = validCodeObj.randomColor();
        context.beginPath();
        var x = Math.random() * canvas_width;
        var y = Math.random() * canvas_height;
        context.moveTo(x, y);
        context.lineTo(x + 1, y + 1);
        context.stroke();
    }
},

 //得到随机的颜色值
 randomColor: function () {
     var r = Math.floor(Math.random() * 256);
     var g = Math.floor(Math.random() * 256);
     var b = Math.floor(Math.random() * 256);
     return "rgb(" + r + "," + g + "," + b + ")";
 }
}

export default validCodeObj